Abstract: Mimosa pigra was reported to occur for the first time in Moc Hoa district, Long An province in Vietnam in 1979. Since then, it continues to propagate, disperse and  spread  in many  places  within the country. Mimosa pigra is an aggressive  invader in the places of non-vigilance  by the people such as roadsides, dikes, field bunds, canals of irrigation and drainage and waste land. It invades strongly  along the rivers , surrounding large resevoirs, wetland reserves or parks. In some cases it is reported that this dangerous weed has invaded agricultural  fields. A lot of effort has been carried out to control Mimosa pigra  sofar but  with  little success. The strong effort  to check the  invasion of this dangerous weed  is needed in  the future.